U.S. environmental chief Scott Pruitt has unveiled plans to roll back at least three Obama-era rules at the EPA while vowing to give businesses “regulatory certainty.”

Those policy reversals, set to start this week, will empower the Environmental Protection Agency to focus on its core mission of protecting the air and water, Pruitt said Saturday in a speech and question-and-answer session on the final day of the Conservative Political Action Conference in Maryland.

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“The previous administration was so focused on climate change and so focused on CO2, some of those other priorities were left behind,” Pruitt said in his first detailed remarks since being sworn in to lead the EPA on Feb. 17. “I really believe that at the end of eight years, we’re going to have better air quality, we’re going to have better water quality because it’s going to be vested in a partnership” with states.